Guard for revolving cutting-tools.



No. 866,044." PATENTED SEPT. 17, 1907'.

G. B. MARSHALL. GUARD FOR REVOLVING CUTTING TOOLS.

No. 866,044. PATENTED SEPT. 17, 1907.

' G. E. MARSHALL.

GUARD FOR REVOLVING CUTTING TOOLS.

, APPLICATION FILED DEG. 29. 1906.

WITNESSES INVENTOH 'A TTORNL' Y.

rm: NURRIS PETERS 00., wnsnmchm, o. c,

CHARLES E. MARSHALL, OF LESTERSHIRE, NEW YORK.

GUARD FOR REVOLVING. CUTTING-TOOLS.

Specification of Letters Patent.

Patented. Sept. 17, 1907.

Application filed December 29,1906. Serial No. 360,095.

To all whom it may concern:

Be it known that 1, CHARLES E. MARSHALL, of the village of Lestershire, Broome county, and State of New York, a citizen of the Upited States, residing at Lestershire, in the county of Broome and State of New York, have invented certain new and useful Improvements in Guards for Revolving Cutting-Tools, of which the following is a specification.

The objects of my invention are to furnish a safe and adjustable guard for revolving cutting tools, which are used in various kinds of manufacturing. And I do hereby declare that the following is a full clear and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, and which form a part of this specification.

Figure 1: is a partial front view, showing the application of my invention to a carving machine. Fig. 2: is a central longitudinal section of my invention taken on the line 2. 2. of Fig. 3. Fig. 3. is a cross section on line 3. 3. of Fig. 2. Fig. 4: is a sectional plan view of my invention applied to a shaping machine, taken on line 4, 4 of Fig. 6. Fig. 5, is a vertical section on line 5, 5 of Fig. 4. Fig. 6 is a broken vertical section on line 6. 6. of Fig. 4.

The purpose and hence the value of my invention arises from the following facts: In machines in the nature of revolving cutting toolswhere the cutting tool revolves at a very high speed, they are exceedingly dangerous to workmen: it is therefore diflicult to obtain competent men to handle them, and as the operation has to be conducted with caution the output of the work is proportionably slow.

The object of my invention is to provide an adjustable shield or guard for the knives or other cutters of cutting tools, which will not only protect the hands of the operator, but materially increase the output of the machine and at the same time not interfere with the operation of the machine in feeding it or otherwise using it.

A is a cap or shield which fits closely over the extreme edge of the knife or tool B and which may be of any suitable shape according to the work to be done, or style of tool to which it is applied. The knife is carried on a mandrel O and secured in place by the lock' nut D which is preferably an integral part of the cap or shield. The collar E is recessed out similar to the cap A to protect the knife B, when two knives are used in which case the knives are separated by the collar F as is commonly done in tools of this description.

Figs. 4, 5 and 6 show my invention applied to an ordinary shaper, which is mounted on a vertical mandrel in the usual way. In this case the knives B B are carried between the collars G, G, over which the guards H, H are fitted and the whole held together on the mandrels by the lock nut D which is common to all shaping tools of this class. As is clearly shown in Fig. 6 the secured guards H, H effectually protect the hands of the operator from the knives B, B.

The cutter illustrated in Figs. 1, 2 and 3 is designed for working thin pieces of material, the material being inserted between the caps E or A, and the spacing collar F. This spacing collar may be omitted, however, and different kinds of cutters secured on the mandrel between the collar E and the cap A, to suit requirements. In this way, material of different thickness may be cut, and by using cutters of various shapes, the material may be shaped to suit. In the form of the invention shown in Figs. 4, 5 and 6, in which the mandrel occupies a vertical position, the material to be shaped is inserted between the guards, caps or shields, as before, and the parts occupy the same relative position as before and may be adjusted or changed in the manner described.

. What I do. claim as my invention, and desire to secure by Letters Patent, is

1. A hollow interiorly threaded mandrel having an integral abutment collar thereon provided with an overhanging rim, a reduced spindle extension projecting from the fixed collar having a plain cylindrical portion and screw threads upon its outer end, and a clamping collar engaged on the threaded end of the spindle provided with an overhanging annular rim, and a cutter or cutters on the plain portion of the spindle clamped between the collars.

2. A mandrel having a hollow threaded stem provided with an annular abutment collar having an overhanging rim, the mandrel having a reduced spindle projecting from the face of the collar, the spindle having a plain .cylindrical portion and an outer threaded end, a cutter on the plain portion of the spindle having its edge protected by the overhanging rim of the abutment collar, a clamping collar mounted on the threaded end of the spindle having an overhanging protective rim, said clamping collar adapted to clamp the cutter against the abutment collar.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES E. MARSHALL.

Witnesses:

M. E. MANNING, B. T. ASH. 

